Fix for crash in GuestViewBase::FindReply.

components/guest_view/browser/guest_view_base.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/guest_view/browser/guest_view_base.h"
 
 #include <utility>
 
 #include "base/lazy_instance.h"
 #include "base/macros.h"
@@ skipping 460 matching lines @@
     return;
 
   is_being_destroyed_ = true;
 
   // It is important to clear owner_web_contents_ after the call to
   // StopTrackingEmbedderZoomLevel(), but before the rest of
   // the statements in this function.
   StopTrackingEmbedderZoomLevel();
   owner_web_contents_ = nullptr;
 
+  element_instance_id_ = kInstanceIDNone;
+
   DCHECK(web_contents());
 
   // Give the derived class an opportunity to perform some cleanup.
   WillDestroy();
 
   // Invalidate weak pointers now so that bound callbacks cannot be called late
   // into destruction. We must call this after WillDestroy because derived types
   // may wish to access their openers.
   weak_ptr_factory_.InvalidateWeakPtrs();
 
@@ skipping 394 matching lines @@
 
 void GuestViewBase::UpdateGuestSize(const gfx::Size& new_size,
                                     bool due_to_auto_resize) {
   if (due_to_auto_resize)
     GuestSizeChangedDueToAutoSize(guest_size_, new_size);
   DispatchOnResizeEvent(guest_size_, new_size);
   guest_size_ = new_size;
 }
 
 }  // namespace guest_view